0494.500NR Littelfuse

Surface Mount Fuses Thin Film > 0603 Size > Fast-Acting > 494 Series RoHS Pb 494 Series Fuse, NRA Special Series Integrated Circuit Protector Description The 494 Series Fast-Acting SMF is an ultra small (0603 size) thin-film device designed for secondar y protection of circuits used in space constrained applications such as hand-held port able electronic devices. This series is 10 0% lead-free and meets the requirements of the RoHS directive. New Halide-Free 494 Series fuses are available to order using the HF suffix. See Part Numbering section for additional information. Features Agency Approvals Compatible with lead- Element-covering material free solders and higher is resist ant to industr y Agency Agency File number Ampere rAnge temperature profiles st andard cleaning operations High performance e10480 250mA - 5A materials provide Mounting pad and improved performance electrical performance are lr29862 250mA - 5A in elevated ambient identical to Littelfuse 431 temperature applications and 434 Series products Electrical Characteristics for Series Marked on top surface Alloy-based element with code to allow ampere construction provides % of Ampere O Opening Time at 25 c rating identification superior inrush withst and r ating 2 without testing characteristics (I t) over 100% 4 hours, Minimum ceramic or glass-based Low profile for height 20 0% 5 sec., Maximum 0603 fuse products sensitive applications 30 0% 0.2 sec., Maximum Flat top surface for pick- and-place operations Additional Information Applications Secondar y protection for space constrained applications: Cell phones Digit al cameras Hard disk drives Datasheet Resources Samples Batter y packs DVD players Electrical Specifications by Item max nom nom Agency Approvals Ampere nominal cold nominal Amp Voltage interrupting Voltage power r ating r esistance melting code r ating r ating Drop Dissipation 2 2 (A) (Ohms) i t (A sec) (V) (mV) (W) 0.250 .250 32 0.5450 0.0 030 158.56 0.0396 x x 0.375 .375 32 0.290 0 0.0 053 128.03 0.0480 x x 0.50 0 .50 0 32 50A 32V AC/DC 0.1870 0.0 087 115.71 0.0579 x x 0.750 .750 32 0.1170 0.0171 107.33 0.0805 x x 1.00 001. 32 0.0710 0.0212 89.10 0.0891 x x 1.25 1.25 32 0.0530 0.0518 84.32 0.1054 x x 1.40 01.4 32 0.049 0.05529 74.84 0.1048 x x 1.50 01.5 32 0.0410 0.0766 81.14 0.1217 x x 1.75 1.75 32 0.0320 0.0903 78.75 0.1378 x x 2.0 0 0 02. 32 0.030 0 0.1103 78.22 0.1564 x x 2.50 02.5 32 35A 32V AC/DC 0.0220 0.1440 76.10 0.1903 x x 3.0 0 0 03. 32 0.0180 0.2403 75.04 0.2251 x x 3.15 3.15 32 0.017 0.27405 63.78 0.20 09 x x 3.50 03.5 32 0.0150 0.4306 74.25 0.2599 x x 4.0 0 0 04. 32 0.0130 0.5760 73.72 0.2949 x x 5.0 0 0 05. 32 0.0 090 0.90 0 0 72.71 0.3635 x x 1. Measured at 10% of rated current, 25C. 2. Measured at rated voltage. 2014 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 10/25/14 Surface Mount Fuses Thin Film > 0603 Size > Fast-Acting > 494 Series Temperature Rerating Curve Average Time Current Curves 100 10 1 0.1 0.01 0.001 0.1 1 10 100 CURRENT IN AMPERES Soldering Parameters t r eflow condition Pb free assembly P T P Critical Zone Ramp-up T to T L P - Temperature min (T ) 150C s(min) T L pre Heat - Temperature max (T ) 20 0C s(max) t L T S(max) - Time (min to max) (t ) 60 180 seconds s Ramp-down Average r amp-up r ate (liquidus Temp 5C/second max. Preheat (T ) to peak) l T S(min) t S T to T - r amp-up r ate 5C/second max. S(max) l - Temperature (T ) (liquidus) 217C l 25 r eflow time to peak temperature - Temperature (t ) 60 150 seconds l Time (t 25C to peak) +0/-5 peak Temperature (T ) 250 C p Time within 5c of actual peak 20 40 seconds Temperature (t ) p r amp-down r ate 5C/second max. Time 25c to peak Temperature (T ) 8 minutes max. p Do not exceed 260C 2014 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 10/25/14 TIME IN SECONDS 0.250 A 0.375 A 0.500 A 0.750 A 1.00 A 1.25 A 1.50 A 1.75 A 2.00 A 2.50 A 3.00 A 3.50 A 4.00 A 5.00 A Temperature